Language of work is proven to be an important variable in order to explain how immigrants integrate to a society and in which language they communicate in public. In the province of Québec and especially in the Montreal CMA, the status of French as a widespread language of work remains unclear. This situation is driven by factors such as globalization, increasing use of technology and demographic trends and figures that help to strengthen the use of English in the public sphere. Therefore, this study will focus on examining Montreal CMA immigrants’ language of work. Some analysis will first provide an overview of immigrants’ language of work in 2006. Then, an emphasis will be put on the key variables explaining immigrants’ linguistic choices on the labour market. Those analyses will be performed using the 2006 Canadian census data. Among the main findings of the explanatory analysis, it should be noted that immigrants’ education and linguistic profile, their country of origin and period of immigration are the variables most strongly associated with the use of French, English or bilingualism at work in 2006. The descriptive analysis showed similar conclusions, reinforcing the major influence of the previously mentioned variables. Finally, this study is useful in assessing the situation of immigrants’ language of work and in suggesting changes to policies regulating immigration trends and immigrants’ linguistic integration.